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Fair Value of Financial Instruments - Liabilities, Recurring (Details) (Recurring basis, USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Estimate of Fair Value, Fair Value Disclosure
   
Long-term Debt, including the current portion:    
Commercial Mortgage $ 73 $ 73
Total Carrying Value in Consolidated Balance Sheet
   
Liabilities Recorded at Fair Value in the Financial Statements:    
Interest Rate Swap Liabilities (included in other non-current liabilities) 83 90
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 83 90
Long-term Debt, including the current portion:    
Senior Notes 4,807 4,716
Convertible Notes 842 939
Term Loans 2,568 2,567
Commercial Mortgage 64 65
Capital Leases and Other 145 163
Total Long-term Debt, including the current portion: 8,426 8,450
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Liabilities Recorded at Fair Value in the Financial Statements:    
Interest Rate Swap Liabilities (included in other non-current liabilities) 0 0
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 0 0
Long-term Debt, including the current portion:    
Senior Notes 5,134 4,822
Convertible Notes 329 247
Term Loans 2,591 2,518
Commercial Mortgage 0 0
Capital Leases and Other 0 0
Total Long-term Debt, including the current portion: 8,054 7,587
Significant Other Observable Inputs (Level 2)
   
Liabilities Recorded at Fair Value in the Financial Statements:    
Interest Rate Swap Liabilities (included in other non-current liabilities) 83 90
Total Derivative Liabilities Recorded at Fair Value in the Financial Statements 83 90
Long-term Debt, including the current portion:    
Senior Notes 0 0
Convertible Notes 969 834
Term Loans 0 0
Commercial Mortgage 73 73
Capital Leases and Other 145 163
Total Long-term Debt, including the current portion: $ 1,187 $ 1,070